How to darken crevices/grooves/engravings
I mentioned Pointiness in the comments and you said you tried it; the thing with Pointiness is that it's a bit hard to handle so you really need to &quot;crush&quot; the value down in something like a Color Ramp.  In this image, both of the stones are exactly the same model, but on the right hand side is the node graph you see below.  Note how the words are visible on the right and invisible on the left?  I squeezed the pointiness values in on both sides of that Color Ramp:

This might not be the exact solution you want, as the bumpiness of the surface and the edges of the stone also show up in my example due to the pointiness, but if you tweak that color ramp you might get the result you're after.  You can also tweak the Mix node to make it more or less subtle.
You can also try the &quot;Advanced Pointiness&quot; from that link I shared in the comments above.  It gets rid of the spottedness and might be more what you're looking for:

Where I have that &quot;Noise&quot; texture that would be where you put your actual texture; I just did that to give the cube some kind of texture.  To adjust the darkness, you can change that -10 to anywhere in the range -10 to 10 based on how sharp you want the color.  0 would be gray and likely invisible.